# fablefusion-charrp-probe — THROWAWAY evaluation seat (ana-ml2 GPU1)

Evaluation-only seat for
[`kkuspa/Qwen3.6-27B-Fable-Fusion-711-Uncensored-Heretic-NM-DAU-MTP-NVFP4A16`](https://huggingface.co/kkuspa/Qwen3.6-27B-Fable-Fusion-711-Uncensored-Heretic-NM-DAU-MTP-NVFP4A16),
a candidate replacement for Dark-Scarlett v1.0 on the `char-rp-reasoning` seat.
Serves as **`char-rp-probe`** on **:8019**.

**This is not a production seat.** It is deliberately not wired into any LiteLLM
alias — per the no-false-aliases rule, nothing may answer to `char-rp-reasoning`
except the real seat. `restart: "no"` so it never resurrects itself.

## Why this candidate

DS v1.0's refusals are too high. Its card explains why: `ReadyArt/Dark-Scarlett-v1.0-27B`
is a *finetune* of stock `Qwen/Qwen3.6-27B`, tagged `unaligned`/`nsfw`/`erp` but
carrying **no abliteration**. The refusal machinery of safety-tuned Qwen3.6 is
still in there. Fable-Fusion 711 is refusal-*ablated* (Heretic, by trohrbaugh) —
a structural edit rather than a behavioural preference.

Verified before pulling:

| | |
|---|---|
| Loader class | `Qwen3_5ForConditionalGeneration` — the wrapper class DS also needs (a flat `Qwen3_5TextConfig` is rejected by both vLLM and SGLang) |
| MTP | **15 `mtp.*` tensors present** in a separate bf16 shard AND individually enumerated in `quantization_config.ignore` — the exact bug that gave us 0% acceptance on the gen seat. Enumerated names are safer than our `re:^mtp.*` regex, which llm-compressor prunes when unmatched |
| Scheme | NVFP4A16 compressed-tensors, `input_activations: null` — same as the DS seat runs today |
| Held at bf16 | vision tower, all 48 DeltaNet linear-attn layers, MTP drafter, `lm_head` |
| KV | FP8 k/v scales calibrated and shipped — the seat already runs `--kv-cache-dtype fp8` |
| Context | 262,144 |
| Fidelity | ARC-C / HellaSwag / Winogrande vs the BF16 parent all within standard error |
| License | Apache-2.0 throughout |
| On disk | `/tank/aimodels/fable-fusion-711-nvfp4a16` (28.55 GB, byte-verified against the HF tree) |

## ⚠️ GPU1 is zero-sum — this seat CANNOT run beside Dark-Scarlett

GPU1 sits at ~94.9/97.9 GB with the utility cluster co-resident. DS holds ~43 GB
at `util 0.44`; this seat needs the same slot. The A/B is **sequential**, and the
`char-rp-reasoning` seat is **down** for the probe window:

```bash
# 1. baseline DS live first (no disruption)
# 2. swap
ssh infra-ops@10.250.50.54 'cd /opt/docker/compose/darkscarlett-charrp-reasoning && docker compose down'
ssh infra-ops@10.250.50.54 'cd /opt/docker/compose/fablefusion-charrp-probe   && docker compose up -d'
# 3. probe :8019, then
ssh infra-ops@10.250.50.54 'cd /opt/docker/compose/fablefusion-charrp-probe   && docker compose down'
ssh infra-ops@10.250.50.54 'cd /opt/docker/compose/darkscarlett-charrp-reasoning && docker compose up -d'
```

## MTP depth: 3, not the card's 5

The card's headline 1.56x (56.2 → 87.4 tok/s on our exact GPU class) was measured
on **greedy** 512-token generations. DavidAU states plainly that acceptance
degrades above temp 1 — and temp 1.0 is the recommended creative setting this
seat gets probed at. DS's own README already concluded spec-decode is net-negative
at RP temps. Depth 3 matches the gen seat; treat any speed gain as unmeasured
until benchmarked at real RP sampling settings.

## Deploy

```bash
scripts/deploy-stack.sh ana-ml2 fablefusion-charrp-probe
# on host: cp .env.example .env   (defaults are fine)
```

Probe harness: [`services/refusal-probe/`](../../services/refusal-probe/).